In this paper, we present a physical modeling activity whose objective is to allow students to determine the differences between a disk and a sphere using pure scientific criteria. Thereunto, we reproduce the Sun-Earth-Moon system with low-cost materials and compare the illumination effects on the Moon considering two possible shapes for it (a…

In this work we describe a teaching proposal to calculate the eccentricity of the Moon's trajectory by applying a geometrical technique. The values of the ratios between the Earth-Moon distance and the diameter of the Moon at apogee and at perigee were calculated from a kinematic model associated with a geometrical technique of image analysis. The…

In her second semester teaching for Arizona State University, the author suddenly found herself teaching a fully online writing course for the first time. Originally she had been scheduled to teach the course in a hybrid format, meeting face to face with students once a week; however, a coding error in the online class schedule resulted in the…

Explains the use of proximity operators as a search technique in online searching, especially in large full-text databases. Differences in proximity operators on various online systems are discussed and future possibilities are considered. (LRW)